Fluid preheater



March '30, 1954 N. A. ARVINS ET AL 2,673,919

FLUID PREHEATER Filed Jan 29, 1952 I INVENTOR. 3 NATHAN A. ARVINSABRAHAM A.ARVINTZ ROBERT'A.ARVINTZ ATTORNEY Patented Mar. 30, 19542,673,919 FLUID PREHEATER Nathan A. Arvins, Brooklyn, Abraham A.Arvintz, Hollis, and Robert A. Arvintz, New York, N. Y., assignors toArvins Viscolator Corporation, Brooklyn, N. Y., a corporation of NewYork Application January 29, 1952, Serial No. 268,846

Claims.

This invention relates to fluid heaters, wherein a fluid is circulatedthrough a heat exchanging unit for delivery to a predetermined point ofdischarge and, further, wherein air is circulated through a coil andheated by the same heating medium for transmission to the same point ofdischarge, as with paint, lacquer and similar preheaters of the typegenerally known in the art.

More particularly, the invention deals with a heater unit having anarrangement of straght fluid circulating coils disposed in a heatconducting body and so mounted in the casing of the apparatus as tofacilitate cleaning of the respective tubes without disturbingarrangement of the tubes in the casing.

The novel features of the invention will be best understood from thefollowing description, when taken together with the accompanyingdrawing, in which certain embodiments of the invention are disclosedand, in which, the separate parts are designated by suitable referencecharacters in each of the views and, in which:

Fig. 1 is a longitudinal section through a heater made accord ng to ourinvention, with part of the structure broken away and shown in a rightangle section.

Fig. 2 is a plan view of the structure, as seen in Fig. 1, with partsofthe construction broken away and in section.

Fig. 3 is a bottom plan view of the structure, as

seen in Fig. 1, with parts of the construction broken away and insection.

Fig. 4 is an enlarged detail sectional view, showing a modifiedarrangement of air coil mounting; and

Fig. 5 is a view s'milar to Fig. 4, showing another modification. I

In Fig. l of the drawing, we have shown a heater comprising an elongatedtubular casing ID, to the lower end of which is secured a header ll,having circumferentially spaced supporting feet l2 cn an outwardlyextending flange portion [3 of the header. At upper and lower ends ofthe tubular cas ng lli are tube plates l4 and 15, with which a series ofcircumferentially arranged fluid circulating tubes [6 are secured.

Secured to the upper header or plate I4 is an upper cap or closure plateconstruction ll, hava ing an outwardly extending flange l8 of similardiameter to the plate or flange l3 and adapted to support an outer tubeor jacket I9. Mounted in the closure plate I1 is an elongated electriccartrdge heater tube 28, having terminals 2i and 22' disposed within thechamber 23 of the closure plate l1. Also mounted in the closure plate I?is an acuastat 24, the circuit wires 25 of which are in circuit with theterminals 2| and 22 and with a light bulb Unit 26 mounted on one wall ofthe cover plate I". as clearly ind'cated in Fi". 2 of the drawing. Thiscircuit is such that the aquastat will indicate temperature of thepreheater; whereas, the light bulb 26 will indicate externally of theheater that the heating unit is in operation or, in other words, thatcircuit is completed to the cartridge heater 2e arrangedin-tube 20'.-

Disposed in the casing H),- around the circulating tubes 16 and thecartridge heater 20' and aquastat 2% is a body of heat conductingmaterial 21, preferably formed from aluminum which can be moulded orotherwise formed around the tubes it, 20 and aquastat 24 and thenarranged in the casing It. This construction will provide an efficientmeans of conducting heat from the heater cartridge 26 tothctubes 16,then to the casing 18 and, thus, to an air coil 28 encircling andcontracting the upper portion of the casing Hi. This coil 28 has intakeand discharge ends 29 and 38, note Fig. 3, which extend from suitablefittin s 3i and 32, respectively, with which ends of thecoil 28 couple.

The coil 28 is contained within a suitable housing, or casing, 33 whichmay be in the form or ahminum fo'l, asbestos cloth,. or the like, toprotect the coils in theoperation of inserting glass-wool insulation 34.into the chamber bei tween the casing l0 and jacket I 9 and outwardlyof the housing 33. This insulation also facilitates heat conductivity tothe air coil 28, as will be apparent.

The top wall of the header II has apertures 36, registering with thetubes l6, and the cap ll has similar a ertures 31, registering with theupper ends of the tubes I6. The'last named apertures open into anannular chamber 38, controlling bypassing of the fluid circulatingthrough one group of tubes I6 and to another group thereof,

th s chamber being closed by a ring plate 39. It i will appear from Fig.l of the drawing that the terminals 2| and 22 and the outer end of theaquastat are disposed within the chamber 23.. This chamber is closed bya detachable cover plate 40.

The header l I has a downwardy extending partition M which divides theheader into an intake 1 chamber 42 and an outlet chamber 43; note also,

The plate to has plugs to arranged in alinement with the apertures andsimilar plugs 46 are disposed in the ring 35, so as to facilitatecleanout of the tube it without displacing the header Ii, plate i l andring 39, the cover plate 40 being removed when this operation isperformed.

Arranged between the casin l0 and jacket l9 at one side of the headerand disposed within the compartment in which the insulation 34' isarranged is an electric conduit 41, which opens into the chamber-E3, ora side extension 23 Coal thereof, as seen in Fig. 1. The extension 23'is closed bya plug 48. The lower end of the conduit 41 couples with anelectric fitting 49 opening out through the jacket 19, the fittin havinga removable plate so to gain access to the interior of the fitting and atubular discharge 5|, through which the circuit wires, which service theheater, aquastat and lamp, pass, as will be clearly apparent. Thefitting 49 is supported upon the flange extension [3, as will beapparent.

Considering now Fig. 3 of the drawing, it will appear that extendinginto the header H is an inlet fitting 52, by means of which fluid to beheated can be introduced into the chamber 42 and, at is shown a similaroutlet fittin for discharging the fluid fromthe chamber 43. In the eventof a build-up in pressure at the discharge end, we provide anotherfitting 54 exposed to the chamber 43, from which fluid can be returnedto a source of supply. It will be understood, inthis connection, that,in most instances, the fluid to be heated, such as paint lacquers andthe like, have a forced circulation through the heating apparatus. Inthis connection, it will be apparent that the extended passage of thefluid through the long circulating tubes [6 will provide an efiicientoperation of the heater.

In Fig. 4 of the drawing, we have shown a modifled mounting of the aircoil in the heater and, in. this figure, l9 represents the outer jacket;lo" the casing; 15 one of the circulating tubes; 21' the heat conductinbody and it will here be noted that the air coil 28 is disposed withinthe casinglo and embedded in the body 21', rather than being disposedoutwardly oi the casing 10,

as in Fig 1.

In Fig. 5 of the drawin we have shown a further modification, wherein 19represents the outer jacket; l5" one of the fluid circulating tubes; andat 28" the air coil. With this C011.

struction, the casing I0 is dispensed with and a heat conducting body55, similar in characteristics to the heat conducting body 21, isemployed, with the exception that means'will be provided to receive thecoil 28" on the surface of the body 55. This means comprises peripheralgrooves, as at 55, in the body 55.

For sake of clarity in the showing, it will be r noted that, at thelower part of Fig. 1 of the drawing, part of the structure is brokenaway to show the cross-section of the partition 4| at right angles tothe showing in Fig. 1 or, in other words, consistent with the showing inFig. 3 ol' the drawing,

Having fully described our invention, what we claim as new and desire tosecure by Letters Pat-.- ent is:

1. A fluid heater of the character described, comprising a tubularcasing having an insulated jacket encircling and spaced therefrom, aplurality offluid circulating tubes extending longitudinally of anddisposed within said casing, means for by-passing fluid from one groupof tubes to another at one end of the casing, the other end of thecasing havin intake and discharge chambers communicating with saiddifferent groups of tubes, means for controlling intake and discharge orfluid with respect to said intake and discharge chambers, a heaterdisposed in said casing and arranged longitudinally with respect to saidtubes, said heater and tubes being enveloped in a body of heattransmitting material, and means providing access to opposed a open endsof the circulating tubes without disturbing mounting of the severalcasing parts of the heater.

2. A fluid heater of the character described, comprising a tubularcasing having an insulated jacket encircling and spaced therefrom, aplurality of fluid circulating tubes extending longitudinally of anddisposed within said casing, means for by-passing fluid from one groupof tubes to another at one end of the casing, the other end of thecasing having intake and discharge chambers communicating with saiddifferent groups of tubes, means for controlling intake and discharge offluid with respect to said intake and discharge chambers, a heaterdisposed in said casing and arranged longitudinally with respect to saidtubes, said heater and tubes beingenveloped in a body ofheattransmitting material, means providin access to opposed open ends of thecirculating tubes without disturbing mounting of the several casingparts of the heater, and said last named means comprising plates having.plugged openings in alinement with ends of thefluid circulating tubes.

3. A fluid heater of the character described,

comprising a plurality of fluid circulating tubes having ends joined bytube plates, a body of insulating material completely enveloping thetubes intermediate said plates, another tube extending into andenveloped by said opening and opening outwardly through one of saidplates for support of an electric heater to heat said body, headerssecured to the tube platescontrolling circulation of a fluid to beheated through said tubes, said headers having outwardlyextendingflanges- 01' greater diameter than-the diameter of said body ofinsulating material, a casing securedto the flanges and enveloping saidbody to form an insulating chamber therearound, insulation arranged insaid chamber, said headers having apertures alined with the ends of saidtubes, plates detachablewith respect to said headers, andsaid plateshaving plugged apertures alined with the apertures of the header tofacilitatecleaning-out of said circulating tubes.

4. A fluid heater of the character described;

comprising a plurality of fluid circulating tubes having ends joined bytube plates, a body of insulating material completely enveloping thetubes intermediate said plates, another tube extendinginto and envelopedby said opening and opening outwardly through one of said plates forsupport of an electric heater to heat said body, headers secured to thetube plates controlling circulation;

of a fluid to be heated through said tubes, said headers havingoutwardly extending flanges-01' greater diameter than the diameter ofsaid body of insulating material, a casing secured to the flanges andenveloping said body to form an insulating chamber therearound,insulation arranged in said chamber, said headers having aperturesalined with the ends of said tubes, plates detachable with respect tosaid headers, said plates having plugged apertures alined with theapertures of the header to facilitatecleaningout of said circulatingtubes, one of said headers having an extension forming a chamber beyondthe plate of said header, a detachable cover controllingaccess to saidchamber, and said chamher being adapted to receive circuit wiresextending to said electric heater.

5. A fluid heater of the character described, comprising a plurality offluid circulatingtubes having ends joined by tube plates, a body ofinsulating material completely envelopingthe tubes intermediate saidplates, another tube extending into and enveloped by said opening andopening outwardly through one of said plates for support of an electricheater to heat said body, headers secured to the tube plates controllingcirculation of a fluid to be heated through said tubes, said headershaving outwardly extending flanges of greater diameter than the diameterof said body of insulating material, a casing secured to the flanges andenveloping said body to form an insulating chamber therearound,insulation arranged in said chamber, said headers having aperturesalined with the ends of said tubes, plates detachable with respect tosaid headers, said plates having plugged apertures alined with theapertures of the header to facilitate cleaningout of said circulatingtubes, one of said headers having an extension forming a. chamber beyondthe plate of said header a detachable cover controlling access to saidchamber, said chamber being adapted to receive circuit wires extendingto said electric heater, and to an aquastat exposed to the heat of saidheat conducting body.

6. A fluid heater of the character described, comprising a plurality offluid circulating tubes having ends joined by tube plates, a body ofinsulating material completely enveloping the tubes intermediate saidplates, another tube extending into and enveloped by said opening andopening outwardly through one of said plates for support of an electricheater to heat said body, headers secured to the tube plates controllingcirculation of a'fluid to be heated through said tubes, said headershaving outwardly extending flanges of greater diameter than the diameterof said body of insulating material, a casing secured to the flanges andenveloping said body to form an insulating chamber therearound,insulation arranged in said chamber, said headers having aperturesalined with the ends of said tubes, plates detachable with respect tosaid headers, said plates having plugged apertures alined with theapertures of the header to facilitate cleaningout of said circulatingtubes, one of said headers having an extension forming a chamber beyondthe plate of said header, a detachable cover controlling access to saidchamber, said chamber being adapted to receive circuit wires extendingto said electric heater, to an aquastat exposed to the heat of said heatconducting body, and an air coil arranged around at least a portion ofsaid heat conducting body and directly exposed to heat radiating fromsaid body.

7. A fluid heater ofthe class described, comprising a body of heatconducting material, means in said body forming a fluid circulatingpassage, through which a fluid to be heated is adapted to be passed, anair coil outwardly of said body, a casing enveloping the body and coiland spaced with respect thereto, the space of said casing havinginsulating material therein, a removable chambered member at the upperportion of said body with a removable cap closing the chamber of saidmember, an electric heating element arranged in said body and havingterminal ends extending into said chamber, an aquastat arranged in saidbody and opening into said chamber, and means for directing circuitwires leading to the heating element and said aquastat out through saidheater.

8. A fluid heater of the class described, comprising a body of heatconducting material, means in said body forming a fluid circulatingpassage, through which a fluid to be heated is adapted to be passed, anair coil outwardly of said body, a casing enveloping the body and coiland spaced with respect thereto, the space of said casing havinginsulating material therein, a removable chambered member at the upperportion of said body with a removable cap closing the chamber of saidmember, an electric heating element arranged in said body and havingterminal ends extending into said chamber, an aquastat arranged in saidbody and opening into said chamber, means for directing circuit wiresleading to the heating element and said aquastat out through saidheater, and said last named means comprising a conduit arranged in theinsulation of the casing and opening into a junction box at the lowerportion of the casing.

9. A fluid heater of the class described, comprising a body of heatconducting material, means in said body forming a fluid circulatingpassage, through which a fluid to be heated is adapted to be passed, anair coil outwardly of said body, a casing enveloping the body and coiland spaced with respect thereto, the space of said casing havinginsulating material therein, a removable chambered member at the upperportion of said body with a removable cap closing the chamber of saidmember, an electric heating element arranged in said body and havingterminal ends extending into said chamber, an aquastat arranged in saidbody and opening into said chamber, means for directing circuit wiresleading to the heating element and said aquastat out through saidheater, said first named means comprising a series of tubes extendingvertically in said body and opening through upper and lower endsthereof, a header at the lower portion of said body and casing, and saidheader being divided to form inlet and outlet chambers controllingcirculation of fluid through said tubes.

16. A fluid heater of the class described, comprising a body of heatconducting material, means in said body forming a fluid circulatingpassage, through which a fluid to be heated is adapted to be passed, anair coil outwardly of said body, a casing enveloping the body and coiland spaced with respect thereto, the space of said casing havinginsulating material therein, a removable chambered member at the upperportion of said body with a removable cap closing the chamber of saidmember, an electric heating element arranged in said body and havingterminal ends extending into said chamber, and aquastat arranged in saidbody and opening into said chamber, means for directing circuit wiresleading to the heating element and said aquastat out through saidheater, said first named means comprising a series of tubes extendingvertically in said body and opening through upper and lower endsthereof, a header at the lower portion of said body and easing, saidheader being divided to form inlet and outlet chambers controllingcirculation of fluid through said tubes, and means comprising aremovable plate for forming a circulating chamber within said chamberedmember,

NATHAN A. ARVINS.

ABRAHAM A. ARVINTZ.

ROBERT A. ARVINTZ.

References Cited in the file of this patent V UNITED STATES PATENTSNumber Name Date 1,985,280 Carleton Dec; 25, 1934 2,421,562 Hynes June3, 1947 2,576,558 Bede Nov. 27, 1951

